FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/legacy.c
1 /*-
2 * Copyright 1998 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: releng/9.2/sys/i386/i386/legacy.c 234150 2012-04-11 20:50:17Z jhb $");
32
33 /*
34 * This code implements a system driver for legacy systems that do not
35 * support ACPI or when ACPI support is not present in the kernel.
36 */
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/bus.h>
41 #include <sys/cpu.h>
42 #include <sys/kernel.h>
43 #include <sys/malloc.h>
44 #include <sys/module.h>
45 #include <machine/bus.h>
46 #include <sys/pcpu.h>
47 #include <sys/rman.h>
48 #include <sys/smp.h>
49
50 #include "opt_mca.h"
51 #ifdef DEV_MCA
52 #include <i386/bios/mca_machdep.h>
53 #endif
54
55 #include <machine/clock.h>
56 #include <machine/legacyvar.h>
57 #include <machine/resource.h>
58
59 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
60 struct legacy_device {
61 int lg_pcibus;
62 int lg_pcislot;
63 int lg_pcifunc;
64 };
65
66 #define DEVTOAT(dev) ((struct legacy_device *)device_get_ivars(dev))
67
68 static int legacy_probe(device_t);
69 static int legacy_attach(device_t);
70 static int legacy_print_child(device_t, device_t);
71 static device_t legacy_add_child(device_t bus, u_int order, const char *name,
72 int unit);
73 static int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
74 static int legacy_write_ivar(device_t, device_t, int, uintptr_t);
75
76 static device_method_t legacy_methods[] = {
77 /* Device interface */
78 DEVMETHOD(device_probe, legacy_probe),
79 DEVMETHOD(device_attach, legacy_attach),
80 DEVMETHOD(device_detach, bus_generic_detach),
81 DEVMETHOD(device_shutdown, bus_generic_shutdown),
82 DEVMETHOD(device_suspend, bus_generic_suspend),
83 DEVMETHOD(device_resume, bus_generic_resume),
84
85 /* Bus interface */
86 DEVMETHOD(bus_print_child, legacy_print_child),
87 DEVMETHOD(bus_add_child, legacy_add_child),
88 DEVMETHOD(bus_read_ivar, legacy_read_ivar),
89 DEVMETHOD(bus_write_ivar, legacy_write_ivar),
90 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
91 DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
92 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
93 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
94 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
95 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
96 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
97
98 { 0, 0 }
99 };
100
101 static driver_t legacy_driver = {
102 "legacy",
103 legacy_methods,
104 1, /* no softc */
105 };
106 static devclass_t legacy_devclass;
107
108 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
109
110 static int
111 legacy_probe(device_t dev)
112 {
113
114 device_set_desc(dev, "legacy system");
115 device_quiet(dev);
116 return (0);
117 }
118
119 static int
120 legacy_attach(device_t dev)
121 {
122 device_t child;
123
124 /*
125 * Let our child drivers identify any child devices that they
126 * can find. Once that is done attach any devices that we
127 * found.
128 */
129 bus_generic_probe(dev);
130 bus_generic_attach(dev);
131
132 #ifndef PC98
133 /*
134 * If we didn't see EISA or ISA on a pci bridge, create some
135 * connection points now so they show up "on motherboard".
136 */
137 if (!devclass_get_device(devclass_find("eisa"), 0)) {
138 child = BUS_ADD_CHILD(dev, 0, "eisa", 0);
139 if (child == NULL)
140 panic("legacy_attach eisa");
141 device_probe_and_attach(child);
142 }
143 #endif
144 #ifdef DEV_MCA
145 if (MCA_system && !devclass_get_device(devclass_find("mca"), 0)) {
146 child = BUS_ADD_CHILD(dev, 0, "mca", 0);
147 if (child == 0)
148 panic("legacy_probe mca");
149 device_probe_and_attach(child);
150 }
151 #endif
152 if (!devclass_get_device(devclass_find("isa"), 0)) {
153 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
154 if (child == NULL)
155 panic("legacy_attach isa");
156 device_probe_and_attach(child);
157 }
158
159 return 0;
160 }
161
162 static int
163 legacy_print_child(device_t bus, device_t child)
164 {
165 struct legacy_device *atdev = DEVTOAT(child);
166 int retval = 0;
167
168 retval += bus_print_child_header(bus, child);
169 if (atdev->lg_pcibus != -1)
170 retval += printf(" pcibus %d", atdev->lg_pcibus);
171 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
172
173 return (retval);
174 }
175
176 static device_t
177 legacy_add_child(device_t bus, u_int order, const char *name, int unit)
178 {
179 device_t child;
180 struct legacy_device *atdev;
181
182 atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
183 M_NOWAIT | M_ZERO);
184 if (atdev == NULL)
185 return(NULL);
186 atdev->lg_pcibus = -1;
187 atdev->lg_pcislot = -1;
188 atdev->lg_pcifunc = -1;
189
190 child = device_add_child_ordered(bus, order, name, unit);
191 if (child == NULL)
192 free(atdev, M_LEGACYDEV);
193 else
194 /* should we free this in legacy_child_detached? */
195 device_set_ivars(child, atdev);
196
197 return (child);
198 }
199
200 static int
201 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
202 {
203 struct legacy_device *atdev = DEVTOAT(child);
204
205 switch (which) {
206 case LEGACY_IVAR_PCIDOMAIN:
207 *result = 0;
208 break;
209 case LEGACY_IVAR_PCIBUS:
210 *result = atdev->lg_pcibus;
211 break;
212 case LEGACY_IVAR_PCISLOT:
213 *result = atdev->lg_pcislot;
214 break;
215 case LEGACY_IVAR_PCIFUNC:
216 *result = atdev->lg_pcifunc;
217 break;
218 default:
219 return ENOENT;
220 }
221 return 0;
222 }
223
224
225 static int
226 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
227 {
228 struct legacy_device *atdev = DEVTOAT(child);
229
230 switch (which) {
231 case LEGACY_IVAR_PCIDOMAIN:
232 return EINVAL;
233 case LEGACY_IVAR_PCIBUS:
234 atdev->lg_pcibus = value;
235 break;
236 case LEGACY_IVAR_PCISLOT:
237 atdev->lg_pcislot = value;
238 break;
239 case LEGACY_IVAR_PCIFUNC:
240 atdev->lg_pcifunc = value;
241 break;
242 default:
243 return ENOENT;
244 }
245 return 0;
246 }
247
248 /*
249 * Legacy CPU attachment when ACPI is not available. Drivers like
250 * cpufreq(4) hang off this.
251 */
252 static void cpu_identify(driver_t *driver, device_t parent);
253 static int cpu_read_ivar(device_t dev, device_t child, int index,
254 uintptr_t *result);
255 static device_t cpu_add_child(device_t bus, u_int order, const char *name,
256 int unit);
257 static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
258
259 struct cpu_device {
260 struct resource_list cd_rl;
261 struct pcpu *cd_pcpu;
262 };
263
264 static device_method_t cpu_methods[] = {
265 /* Device interface */
266 DEVMETHOD(device_identify, cpu_identify),
267 DEVMETHOD(device_probe, bus_generic_probe),
268 DEVMETHOD(device_attach, bus_generic_attach),
269 DEVMETHOD(device_detach, bus_generic_detach),
270 DEVMETHOD(device_shutdown, bus_generic_shutdown),
271 DEVMETHOD(device_suspend, bus_generic_suspend),
272 DEVMETHOD(device_resume, bus_generic_resume),
273
274 /* Bus interface */
275 DEVMETHOD(bus_add_child, cpu_add_child),
276 DEVMETHOD(bus_read_ivar, cpu_read_ivar),
277 DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
278 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
279 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
280 DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource),
281 DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
282 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
283 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
284 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
285 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
286
287 DEVMETHOD_END
288 };
289
290 static driver_t cpu_driver = {
291 "cpu",
292 cpu_methods,
293 1, /* no softc */
294 };
295 static devclass_t cpu_devclass;
296 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
297
298 static void
299 cpu_identify(driver_t *driver, device_t parent)
300 {
301 device_t child;
302 int i;
303
304 /*
305 * Attach a cpuX device for each CPU. We use an order of 150
306 * so that these devices are attached after the Host-PCI
307 * bridges (which are added at order 100).
308 */
309 CPU_FOREACH(i) {
310 child = BUS_ADD_CHILD(parent, 150, "cpu", i);
311 if (child == NULL)
312 panic("legacy_attach cpu");
313 }
314 }
315
316 static device_t
317 cpu_add_child(device_t bus, u_int order, const char *name, int unit)
318 {
319 struct cpu_device *cd;
320 device_t child;
321 struct pcpu *pc;
322
323 if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
324 return (NULL);
325
326 resource_list_init(&cd->cd_rl);
327 pc = pcpu_find(device_get_unit(bus));
328 cd->cd_pcpu = pc;
329
330 child = device_add_child_ordered(bus, order, name, unit);
331 if (child != NULL) {
332 pc->pc_device = child;
333 device_set_ivars(child, cd);
334 } else
335 free(cd, M_DEVBUF);
336 return (child);
337 }
338
339 static struct resource_list *
340 cpu_get_rlist(device_t dev, device_t child)
341 {
342 struct cpu_device *cpdev;
343
344 cpdev = device_get_ivars(child);
345 return (&cpdev->cd_rl);
346 }
347
348 static int
349 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
350 {
351 struct cpu_device *cpdev;
352
353 switch (index) {
354 case CPU_IVAR_PCPU:
355 cpdev = device_get_ivars(child);
356 *result = (uintptr_t)cpdev->cd_pcpu;
357 break;
358 case CPU_IVAR_NOMINAL_MHZ:
359 if (tsc_is_invariant) {
360 *result = (uintptr_t)(atomic_load_acq_64(&tsc_freq) /
361 1000000);
362 break;
363 }
364 /* FALLTHROUGH */
365 default:
366 return (ENOENT);
367 }
368 return (0);
369 }
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